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Reports an HTML element without a closing tag.
Some coding styles require that HTML elements have closing tags even where this is optional.
<p><b>Example:</b></p>
<pre><code>
  &lt;html>
    &lt;body>
      &lt;p>Behold!
    &lt;/body>
  &lt;/html>
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  &lt;html>
    &lt;body>
      &lt;p>Behold!&lt;/p>
    &lt;/body>
  &lt;/html>
</code></pre>
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